Nut-machine



E'. HoL'LlNGs.

ATTORNEYS.

E. HOLLINGS. 4NUT MACHINE.

APPLICATION FILED Aua.2o| |917.

3 SHEETSQSHEET 2.

1N VEN TOR;

BY-. E

A TTORNE YS.

E. HOLLINGS.

NUT MACHINE.

APPLICATION FILED AuG.2o. 1911.

1 ,346,889, Patented July 20, '1920i 3 'sHEers-SHEET 3.

IN VEN TOR.

BY A

A TTRNE Ys.

UNITED; STATES ERNEST HOLLINGS, OF CLEVELAND, OHIO.

NJIT-MACHINE,

Specification of Letters Patent.

Patented July 20,1920.

Application led August 20, 1917. Serial No. 1,857,306.v

T o all whoml z'zmag/ concern.'

Be it known that I, ERNEST HoLLINGs, a subject of the ling of England,residing at Cleveland, in the county of Cuyahoga and State of Ohio, haveinvented certain new and useful Improvements in Nut-Machines, of whichthe following is a specification.

This invention relates to nut forming machines and more particularly tomachines for hot forging or pressing nuts.

The object of the invention is to provide an improved machine forforming nuts from a bar by the combined action of a set of indenting,cut off, and crowning tools, and piercing punches, and in which thepiercing tool is quickly withdrawn from the blank after the piercingoperation and before the blank is ejected from the die to prevent thenut from freezing or shrinking upon the punch. A further'object of theinvention is to improve the arrangement of the cams, levers and othermechanism for producing such movement of the tools and punches, and toalso provide an operating lever for one of said ,tools which also servesas an oil res ervoir to lubricate the machine or parts thereof.

Further objects of the invention are in part obvious and in part willappear more in detail hereinafter.

In the drawings, which represent one form of machine embodying theinvention, Figure 1 is a longitudinalv sectional elevation on the line11, Fig. 2; Fig. 2 is a plan view; Fig. 3 is a sectional elevation onthe line 3 3, Fig. 1, looking in the direction of the arrows; and Figs.4, 5, and 6 are respectively a side elevation, plan and end view on alarger scale, of a rocker lever.

The machine shown in the drawings comprises a suitable frame 1 Vservingto support the bearings for three operating shafts 2, 3 and 4 providedwith driving gears 5,6 and 7, of which gears 5 and 6 intermesh with eachother and gears 6 and 7 mesh with a common driving gear 8 on the powershaft 9 havcarrying it into the die block 18, and a slide 19 slid'ableupon the slide lvand carrying the punch 20. To actuate slide 16 shaft 4is provided with an eccentric crank portion 21` Shaft 2, at the left inFig. 1, actuates a" slide 27 carrying the crowning tool 2.8 and a slide29 slidable upon slide 27 and carrying the piercing punch 30. Slide 27carries two anti-friction rollers 31 which coperate with cams 32 onshaft 2 to advance said slide, and said slide is retracted either by theaction of the blank entering the die or by the retreat of the piercingpunch, as will appear.

Slide 29 is provided with a roller 33 cop` erating with the cam` 34 toadvance said slide, and is retracted by the lobes 35, 36 on the sides ofcam 34, which engage rollers 34a carried by a lever 37 fulcrumed in theframe, and whose forward end is provided with a projection 3 9'lying inadvance of a shoulder 4() on the slide 29.

The lever 37 is a hollow forging or casting having a bottom 41 curved orsloping upward toward both ends and also provided with side walls 42forming a chamber 43 which is filled with a suitable lubricant, such asa heavy oil. Cam 34 with its side lobes 35, 36 dips down into this oilreservoir at each revolution ofthe shaft and carries oil to the rotatingshaft and cam parts at this end of the machine.

The slidev27 has .a depending portionv44 lying in front of a heavy bar45 extending across the machine and backed by the pressure springs 46which transmit the pressure to the stationary frame.

When the slide 27 is retracted or pushed back it encounters the bar 45and then can only be moved back a 'short distance farther by compressingsaid springs.

In describing the operation of the machine we will assume that the slide16 is fully re. tracted, that shaft 4 rotates in a counter clock-wisedirection, Fig. 1, and that the bar of stock has just been advanced orfed one ,Step to abut or engage the Stop v.15.. One comvplete cycle ofoperation of the machine carries each of the shafts 2, 3 and 4 throughexactly one revolution. I

During about the first 105O the indenters operate to nick the blank andwithdraw, the slide' 16 in the meantime advancing toward the stock.' Atabout 130 to 135O the cut of tool- 17 shears the nicked blank from thebar and carries it into the die block against the end faces of thecrowning tool 28 and piercing punch 30, which move back until thesprings 46 have been compressed practically to the limit. This operationcompresses the blank and partially produces the crown thereon.

At about 165o the cam 24 advances the punch 20 while at the same timecam 34 begins to advance the piercer 30. The two punches enter thecenter of the blank and thin the slug to about half the thickness of theblank until at about 1800 the nut has been full expanded into the die,pressed to shape and crowned. At this point the cross bar has reachedits seat on the stationary frame sothat the cut-off tool is pressing thenut against a perfectly rigid backing. The piercer 30 is now movingforward and shears the slug out, carrying it back into the hollowcut-off tool against the retreating punch 20 to the full limit of theoperation of cam 34 atfabout 1900, whereupon the piercer 30 is quicklywithdrawn to get it out of the hot pierced blank and prevent said blankfrom shrinking, cooling or freezing upon the punch, as sometimes occurswith other machines not so arranged.

The piercer 30 is moved back or withdrawny from the blank by the cam 35which oscillatesvthe lever' 37 Whose projection 39 pulls back theshoulder 40 of slide 29.

Cam 32 now comes into action, advancing slide 27 and causing thecrowning tool to eject the formed nut from the die. Said nut can bekicked oif from the end of the crowning tool by a suitable kicker ifdesired, such for example as that shown and described in my priorapplication for nut blank forming machine filed Feb. 16, 1917 Ser. No.149,120. Camv 36 then oscillates the lever V37 a second time andwithdraws the slide 29 which is provided with a shoulder 47 cooperatingwith a shoulder 48 on slide 27 to produce a simultaneous retreat ofslide 27. The cam 25 then advances the punch 20 to eject the slug fromthe cut-off tool 17, and said slug may be kicked off from the cut-oiftool by a suitable device, such for example as that shown in my priorapplication for nut machine filed April 6, 1917 Ser.4 No. 160,206. rThiscompletes the cycle of operations of the machine.

The quick withdrawal ofthe piercing punch prevents injury to the toolsor machine, as there Ais no opportunity for the -blank to freeze to saidtool and possibly break it off or jam the machine.V During the entireoperation the cams are also revolving in a bath of oil in the chamberedlever 37 and consequently are thoroughly lubricated.

Vhat I claim is 1. A nut machine, comprising a die block, reciprocatingtools, a cam shaft for actuating said tools, and a lever operativelyconnecting said shaft and tools, said lever being arranged to serve as areservoir for lubricant.

2. A nut machine, comprising a die block reciprocating tools, a camshaft for actuating said tools, and a lever operatively connecting saidshaft and tools, said lever'being arranged to serve as a reservoir forlubricant for said shaft.

3. A nut machine, comprising a die block,

reciprocating tools, a shaft, a lever opera-

